Crystal Clear Lead-Free Borosilicate Glass: Crafted from high-quality borosilicate glass with exceptional clarity, these glass vials are free of impurities and bubbles. The transparent body allows easy visual inspection of contents, while the lead-free, non-toxic material ensures safe storage for various liquids or powders. Leak-Proof Dual Sealing System: Each empty vial comes with a rubber stopper and a plastic-aluminum flip cap, creating a robust airtight seal. This double protection effectively blocks moisture, oxygen, and contaminants, making these sterile vials reliable for preserving sensitive samples or injection preparations. Leak-Proof Dual Sealing System: Each empty vial comes with a rubber stopper and a plastic-aluminum flip cap, creating a robust airtight seal. This double protection effectively blocks moisture, oxygen, and contaminants, making these sterile vials reliable for preserving sensitive samples or injection preparations. Leak-Proof Dual Sealing System: Each empty vial comes with a rubber stopper and a plastic-aluminum flip cap, creating a robust airtight seal. This double protection effectively blocks moisture, oxygen, and contaminants, making these sterile vials reliable for preserving sensitive samples or injection preparations. Complete Set Ready to Use: Each package includes vial caps, rubber stoppers, and the vials themselves—no extra parts needed. Simply assemble and seal. This all-in-one convenience saves time and ensures you have everything required for secure storage or sample handling.